You have found an interesting coin. It sounds like a minting error. If it is, the coin carries value to collectors of such coins. If damage was inflicted to the coin after it left the mint, it has no value to collectors.

The picture shows a mild example of a Lincoln cent that was 'struck through grease.' Grease filled the E in the coin striking machine and no E appeared on the final coin.

This minting error is worth a few US dollars. The coin in the picture might sell to an enthusiastic collector for $3 to $8 US dollars. A dealer would pay, perhaps, 50 cents or one dollar for the coin.